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Reports <code>if-then</code> expressions that can be folded into safe-access (<code>?.</code>) expressions.
<p><b>Example:</b></p>
<pre><code>
  fun bar(x: String) = ""

  fun foo(a: String?) {
     if (a != null) bar(a) else null
  }
</code></pre>
<p>The quick fix converts the <code>if-then</code> expression into a safe-access (<code>?.</code>) expression:</p>
<pre><code>
  fun bar(x: String) = ""

  fun foo(a: String?) {
     a?.let { bar(it) }
  }
</code></pre>
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